JPS5882678A - Coarse tissue organic matter coupled grinding body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Disclosure The present invention provides a grinding wheel for grinding, rough grinding and cutting with a rough structure having an extremely high processing rate of 1%. By increasing the filler-to-resin ratio when the reduced content is not compensated for by active filler and thus resulting in a composition with a better structure, the same dimensions, volume, degree of cohesion and structure can be obtained. The present invention relates to an abrasive wheel containing substantially higher amounts and proportions of active filler than those normally mounted on the abrasive wheel.

TECHNICAL FIELD This invention relates to grinding wheel compositions for producing what are known in the industry as relatively highly bonded, coarse-textured, reinforced or unreinforced, organic-bonded, thin disc grinding wheels and circumferential grinding wheels. In particular, cold-pressed grindstones are used for grinding, roughing and cutting metal from weldments and sprues and feeders from castings, and for cutting carbon steel and stainless steel bars. Used for cutting.

tIIL Various methods are known for changing the grinding performance (life, grinding speed, etc.) of cold-pressed organic bonded grindstones. These techniques generally include changing the porosity in the wheel structure, changing the resin hardness by baking at different temperatures, and changing the binder filler versus resin. This includes changing the ratio of

Another less commonly used method of altering grinding performance is altering the ratio of binder (resin and filler) to abrasive in the wheel structure. Especially in medium to dense cold-pressure grinding wheels, if the abrasive content is reduced to create a coarser structure and supplemented with an equal amount of binder, the wheel will act softer, i.e. the metal grinding amount will increase. and the grinding wheel life (
It is commonly known that the grinding G ratio) #'i will decrease in constant pressure grinding. The usual explanation for this phenomenon is that as the texture becomes coarser when the abrasive content decreases, the obstacles (interferences) in chip formation decrease as well;
The abrasive wheel now cuts more freely with a significant increase in metal grinding speed. however,
As the force applied to each abrasive grain increases, the life of the abrasive wheel, or G
ratio decreases significantly.

Conventionally, for each and every bonding wheel, as the texture number increases from lower to higher, the volume of the pores remains constant and the volume of the abrasive decreases by a certain amount until the volume equal to it increases. is supplemented by a premix with a constant ratio of resin to filler content. Similarly, as the degree of bonding of the grinding wheel increases from soft to hard for all texture numbers, the volume of the abrasive remains constant, the porosity volume decreases by a certain amount, and the same volume increases for a fixed ratio of resin. Supplemented by pre-mixing with filler content. Thus, in each case, the premixed binder compensates for either the reduction in pore volume and/or abrasive volume, and the resin-to-filler ratio remains constant independent of changes in texture number. left alone.

In contrast, the technical idea proposed by the present inventor is to compensate for the decrease in the abrasive content with an equal volume of active filler material when changing the structure, thereby increasing the ratio of resin to filler. This means changing the ratio.

Thus, a grindstone with a coarse texture (high texture number) has a large filler-to-resin ratio.

The present inventor has discovered that C, V, Ru, and 8°Nar as described and disclosed in U.S. Pat.
Grinding conditions under which a relatively constant force is applied by a relatively dense steel removing wheel containing an abrasive material with a low ayinam content, a filler material with a high kana content, and a certain amount of resin with a substantially low kana content. We also acknowledge that we have unexpectedly discovered that it is possible to achieve significantly higher values of grinding ratios and metal grinding speeds and to improve grinding performance.

In contrast, one inventor has discovered that the filler portion of the binder is an active grinding aid (aativ* grlndlng ald).
) In other words, if the filler part consists of one or more finely pulverized materials to increase and improve the quality and processing efficiency of grinding, the abrasive content can be reduced and the same volume of binder as mentioned above can be used. However, this time only increasing the active filler in the binder to compensate for the reduction in abrasive, thus leaving the resin content unchanged, results in a surprising improvement in grinding performance. I discovered that.

In addition, a medium-density cold-formed abrasive wheel with improved grinding quality and throughput reduces the abrasive content and correspondingly increases the active filler content, and according to Rue et al. They could be produced by increasing the resin content differently. This increased resin content is necessary for cold-cut shapes and extends its effectiveness to grinding wheels K with higher porosity and less compactness.

DISCLOSURE OF THE INVENTION Cold-formed or cold-press-hardened organic-bonded abrasive bodies, such as disc-shaped and circumferential metal grinding and cutting, with relatively coarse texture and relatively high grinding efficiency, performance, and service life. The wheel contains an equal volume or larger amount of active filler to replace the reduced abrasive content, such that coarse-textured wheels have a grinding section with a greater filler-to-resin ratio than dense-textured wheels. have.

The grinding part of the grinding body or whetstone has 12 to 100 grinds, abrasive grains suitable for grinding small-sized metals have a volume of 30 to 44, organic thermosetting resin has a volume of 24 to 36, and active filler 1e #14 to 2.
9 volumes and 5 to 18 volumes. In addition, the grinding section can include one or more suitable wetting agents θ to 5 volumes considered to be part of the resin content. If desired, the grinding body is a suitable and conventional disc of coarse mesh fiberglass cloth, glass, or other fibers, and (also Fi) a strong non-abrasive back or center adjacent to the grinding part. can be reinforced with parts. In certain applications, grinding bodies are
Grinding of metal workpieces to be ground or cut with what is known as a rough surface (rough 51de-z) provides a nick that improves the quality of the finish and prevents seizure.

BEST MODE FOR CARRYING OUT THE INVENTION The organic substance-bonded grinding body of the present invention can be used for grinding, polishing or rough finishing (#striped grinding) metal from various types of workpieces, welded products or castings, metal mouth, A medium to low porosity primitive braided fiber (with a high l wire number) that is cold-open-formed or cold-pressed and then hardened, which is usually used to cut fiber, par or strip, f materials into short lengths. Preferably, it is a grindstone.

In most cases, the grinding body is a cold-pressed, relatively hard-bonded, coarse-textured grinding wheel with a porosity of 5 to 18 cm by volume of the grinding section.

It has been found that the grinding performance, efficiency and life of a cold-pressed wheel can be improved by replacing the abrasive material in the grinding section with an active filler without impairing the strength and safety of the wheel.

Thus, the cold-pressed abrasive wheels of the present invention provide a much higher filler-to-resin ratio without sacrificing strength and safety, and thus provide a higher filler-to-resin ratio than conventional conventional grinding wheels of comparable size, volume, degree of bonding, and texture. The grinding bodies of the present invention, which contain significantly more active filler than is normally contained in cold-pressed wheels, can be made of fused aluminum oxide, fused alumina-zirconia, sintered alumina e-zirconia, sintered alumina, sintered monoxide, The abrasive section includes 30 to 44 pieces of any suitable well-known and conventional abrasive material of silicon carbide or mixtures thereof.

The abrasive material used in the grinding section preferably has a grain size of 12 to 100 micrometers, or an average grain size of 173 to 2,250 micrometers.

A conventional resonoid bonding agent mixed with at least one active filler material is used to bond the abrasive wheel composition together. The organic binder is the crosslinking agent hexamethylenetetramine 9
Thermosetting mixtures of both liquid phenolic resins and powdered phenolic resins are preferred. Suitable powder resins include R@1ehold Ch@mleal as V.
areum part Kame Niagara Falls, Engineering 1-! The lac resin is Vareum 29344 standard thermoset resin modified phenolic resin, sold by A. But thermosetting phenol? Other compositions of lac resin and hexamethylenetetramine 6-16- may also be used.

Other suitable thermosetting resins include phenoxy resins, phenol-furfural resins, aniline formaldehyde resins, urea formaldehyde resins, polyurethane resins, cresol aldehyde resins, resorcinal aldehyde resins, urea aldehyde resins, melamine formaldehyde resins, and There are mixed resins of these.

Thermosetting resins can be modified using small amounts of various resin-based materials. These include engineered 4xy resins, vinyl resins, vinyl chloride, vinyl butyral, vinyl formal, vinyl acetate, crosslinking agents such as /4 formaldehyde or hexamethylenetethumine, and suitable plasticizers or solvents such as furfural alcohol. , 79t and mixtures thereof.

The resin content in the grinding section of a grinding wheel with different abrasive content and similar dimensions would be between 24 and 36 volumes.Include in the grinding section to improve strength, reduce cost, and most importantly, improve the grinding process. There are various organic and inorganic fillers and mixtures that can improve the rate.

The filler is usually considered to be part of the binder and is finely ground tortoise. It can include organic and inorganic materials of various particle sizes that are sufficiently small (as the next grinding abrasive).

Suitable conventional and well-known chemically active fillers include cryolite, fluorite,! Gnesia, lead oxide, legal natric^
, pyrite (disulfide), iron sulfide, potassium sulfate, 7. Potassium borate
), potassium aluminum fluoride, potassium magnesium sulfate, alkali metal chloroferrate, alkali metal chlorofluoroferrate, copolymer of vinylidene chloride and vinyl chloride (5aranB), vinylidene chloride, vinyl chloride , other sulfides, sulfates, fluorides, fluorides, and mixtures thereof.

A preferred active filler material is a mixture of 50 volumes of 1206 mm sea-size potassium sulfate and 50 volumes of iron disulfide, also known as 325 mm size pyrite.

Furthermore, the grinding body of the present invention can be used in a variety of conventional 1/4 inch (1/4 inch)
It can be safely reinforced with cut glass fibers of up to 6 m), short or long continuous lengths of inorganic fibers, and/or coarsely meshed glass fiber cloth disks. The glass fiber cloth can be twisted or substantially untwisted strands or rovings of known continuous glass filaments.

Other wheel reinforcement means can be used.

For example, it is well known to add to high speed wheels what is known in the industry as reinforcing centers to increase safety and burst resistance and thus allow safe high speed operation of the wheel.

The reinforcing center is reinforced with a fine circumferential central non-ground part or an annular inner non-ground part around the shaft (spindle) which has a hole and is usually attached by clamping to the flange of the drive shaft. Usually consists of

Adjacent to the periphery of the reinforced core is an annular outer grinding section made of the abrasive composition of the present invention. Thus, it is the composition of the grinding part of the grinding wheel to which the present invention is directed.

To evaluate the grinding action of replacing the abrasive grains with active filler and increasing the texture number from 7 to 15, a 16-inch diameter test tube containing a replicate of each of the ten compositions listed in Table 1 was used. (406sn) x 5/32" (3,96 brocade) x 1" (25,4m) hole diameter cutting wheel, making the first large patch for the cutting wheel, straight 41 V2 of 304 stainless and 01018 carbon steel. inch (3,81c
m) was cut and tested as a circle.

Margins below Table 1 Whetstone composition 1 2 3 4 5 6 7 8 9
10 degree of coupling/jllilli T7 V7
V9 Vll V13 V15 V9 Vll V1
3 V13 pore 141010□10101
0101010 10 All cutting wheels each have the same 50-24 volume specified for a particular organization number.
grid size and 50-30 grid size (9
30 to 1035-r micrometres) of aluminum oxide 1-rim abrasive grains. When the abrasive content is reduced at a rate of four volume strokes, as is customary in the case of high texture numbers, an equal volume of active filler is substituted. Similarly, if the grinding wheel increases from T7 to V7 bonding with the same texture number, the pore volume decreases by 4 volumes and is compensated for by an increase in binder containing about 3 volumes of resin and about 1 volume of filler material, 9G. be exposed.

(Note) With the exception of grindstone compositions 1217-10, grindstones with the same degree of bonding have the same volume of resin and the same pore volume regardless of the structure number.

The first group of wheels, 1.2, was the conventional T and It is a V grade and texture number 7 whetstone.

The standard cold pressure grinding wheels 1 and 2 in the prior art have a lower volume of 50 vol. of abrasive grains compared to other grinding wheels, a lower 9 vol. and 1.
Filler with 0 valley volume, and 27 volume and 30 valley width.
Resin, 10't! volume and contains 14 volume at-pores. Previously, it was believed that the large volume of the abrasive material was the most important factor in increasing the grinding efficiency of cold-pressure grinding wheels.

Grinding wheels 3 to 6 of the second group of stripes were used to evaluate the effect of placing the abrasive grains in the same volume of active filler according to the present invention while keeping the resin at a constant volume in the grinding wheels with a specific degree of bonding. This is the first series whetstone with the degree of bond and structure v9 to V15 created in #3 and the degree of bond and structure v9 to V1
The No. 5 Nigiries whetstone evaluated the grinding effect of replacing the abrasive with a large amount of resin and a small amount of filler.
It was made for comparison with the grinding wheels of Group and 1st IN (T7, V7).

The grinding wheel 10 after the moth is the 30th V13 bonding and tissue grinding wheel, and the volume of the filling material and fM white is compared to the other V13 grinding wheels 5,9
It was created to evaluate the effectiveness of further changes to 11 in the middle.

When each composition was prepared and formed into a grinding wheel, the active filler and binder comprising VARCUM V29344 powdered phenolic resin were dry and then wet mixed together with CARBO8OTA (20CC/PoyP dry wood I11').

The abrasive grains were wetted and mixed with a miscible liquid phenolic resin that made up about 18 - of the total volume of resin in the composition. The binder is then mixed with the moistened abrasive grains to form a mixture of cyfurfural and CL40 (chlorinated) type 3. It was further moistened by ~6 cc (6.6-13.2 CI).

CARBO8OTA is a registered trademark of Refined Coal Tar Cresol Oil Moisturizing or Wetting Agent commercially available from CARBO8OTA iljl Shea2ido Chemical Andda.

Moisturizing or humectant furfural CL40 and CA
RBO80TA is preferably included in a small amount of the grinding portion of the grinding wheel, and is considered as part of the hardened resin content of the grinding wheel.

However, the grinding part of the whetstone is furfural.

Furfuryl alcohol, liquid resin, CARBO80T
A.

A suitable wetting agent consisting of CL40 (chlorinated/9 rough-in) or mixtures thereof may be included.

Each of the prepared mixtures of grinding wheels and binders was placed in a suitable mold, and the total pressure was 600-900 tons (544,3~
It was cold-pressed at 826.4 meters T). Grinding wheels 2-6 require essentially the same forming pressure of 800-900 tons (725,7-826.4 meters) total pressure, and grinding wheel 1° requires approximately 600 tons (44.3 meters) total pressure. T) was molded.

The whetstones were demolded and baked or post-cured at 175°C for 17 hours. Except for whetstone 6 (V15), all of the other whetstones 1 to 7 contained in resin content 27 to 33 volume*1 were cured well. , while wheels 8 to 10 with higher resin content showed signs of excess flow during baking, and thus wheel 9 (Ml 3 ) with still higher resin content of 39 yen did not harden as well and was therefore tested. There wasn't.

Except for defective grinding wheel 9, all other grinding wheels are t-8t.
One Ml 50 hydraulic machine is attached to a whelk cutter and cuts 3/2 inch (3,81 cl11) diameter stainless steel and C1018 carbon steel bars at 12,000 fpm (
Dry cutting was performed at a constant feed rate and constant pressure at a grinding wheel rotation speed maintained at 61,08 MPS).
2 at constant feed rate cutting in 4 seconds and 9 seconds respectively.
0 cut pieces, 554 nds and 70/nds (121 nds)
, 25 to I54.3 yu) and C1018 carbon steel was cut in 2.5 seconds to produce 30 pieces each.

The thickness of each wheel was measured before and after each test to measure wheel wear and G ratio, and the diameter was measured before and after each series of 10 cutting pieces and compared to the amount of metal removed. In addition, the average peak kW power consumption and time per disconnection are measured, and 1
0 sections were recorded for each series. Finally, the extent of workpiece burn-in in percent was observed and recorded for each series of 10 cut pieces.

The results of the comparative grinding tests are shown in Tables 2, 3, and 4. A scale often used to measure 1°, 1
, T.

The surprising result of the test was that increasing the texture number from 7 to 15 and increasing the ratio of active filler to resin content in place of the abrasive, the same bonding degree of abrasive containing a smaller amount of abrasive It has been revealed that the performance and quality of the whetstone will be significantly improved.

For example, in dry cutting of 304 stainless steel at constant speed, φ4. The Vll wheel composition is similar to a conventional standard φ2. Consumes 99b less power and 11% less power at constant pressure than V7 wheel composition
Produced a large G ratio and wheel life, cut 6-faster with 20-good life and G-ratio.

The data also show that wheel compositions 7, 8 and 10, including wheel V9. V11
．． The performance of V13's Nijiries is +7. V9t-excluding-
(V9.Vll, standard φ2.v7 and S1.T7 grinding wheels with higher abrasive content, which is lower than the performance of the first series of V13, but is taught to be necessary to enhance the grinding process'4 The composition quality is good.

ζ Therefore, in the test for cutting 304 stainless steel, the most excellent coarse structure (DV grade grindstone is φ4゜Vl1 composition, followed by performance order is 5.Vl3゜φ7.V9.φ
3TV9eφB, Vll, S2゜V7. φ6, Vl
5, and ÷10. V13 wheels, these all O wheels contain less resin and filler than standard O÷1.
It has been shown to perform better than a T7 (cohesion/texture) grinding wheel.

55 lbs. and 70 lbs. as shown in the 3rd column before.
The result of cutting 304 stainless steel with a constant spindle pressure of 4.5 mm was that of Vl3 and V15 grinding wheel compositions with a coarse texture. v7 and φ1. This shows that the T7 textured wheel) also cuts faster up to 25g6, but has a relatively lower G ratio and therefore wheel life. Again, the φ4
t V 11 grinding wheel composition is standard 2. It showed better grinding quality, 20- better G ratio and life, and 6s faster cutting speed than the v7 textured wheel composition.

This shows that even coarsely textured grindstones do not work well in cutting 01018 carbon steel and have a strong tendency to seize on the workpiece. This was due to the properties of urea and the relatively smooth surface of the grinding wheel, which usually produces high friction and heat.

A large number of grindstones of each composition were subjected to speed burst tests, and the average results are shown in FIG.

The bursting speed & shown in table #I5 below reflects the strength and safety of the tested grindstone.

The data shows that if the reduction in abrasive material is supplemented with only activated light crosspieces, the strength and therefore the safety of the grinding wheel will be the same as standard φ2. This shows a slight decrease compared to that of the v7 whetstone. However, the surface speed and therefore the strength and safety are still sufficiently high compared to the required values, and the grinding wheel rotates at
0 (sfpm) (61,0 ampm). Second shift 0-ff) $7. V9. $8. Vll,
$10. A slight increase in the resin-containing lid of the Vl3 grinding wheel composition increases its strength and therefore safety to φ2. Maintained at the level of v7 whetstone.

16 inch diameter (406 m) x 1/8 inch thickness (3,
17 ■) x 1 inch hole diameter (25,4 ■), a bond of 81 teeth and a v1 structure grade 7 to 13 cutting wheel, made a second larger patch for cutting wheels previously cut in 01018 carbon steel. A roughened surface was provided to alleviate the problem of burn-in.

The composition of the camphor grinding wheel was adjusted as before, and approximately 450 tons (408.2 meters) was prepared by R Grade Co., Ltd., with the aim of achieving a high degree of bonding, using a frame lined with foam to form a rough surface. , T grade was cold-greased at 600 tons (544.3 meters T) and V grade at 700-850 tons (6j0.9-771.1 meters T).

Figure 6 lists the various degrees of bonding and texture compositions 11-23 for which second patch wheels were made and tested. It is also known that the actual density of the grinding wheel after it has been baked and hardened may be less than the measured density/density increase varies. It also depends on how the cold-pressed green stone is held and placed during baking and hardening. - Table 7 shows a 460 lb.
f) The volume, degree of bonding, and structure after hardening that were actually measured for each of the cold-pressed green grindstones with theoretical bonding degrees R, T and v1 structure numbers 7 to 13, which were tightened with the pressure of f), are shown.

The hardened wheel data shown in FIG. 7 shows a significant increase in density with respect to the theoretical or green compact values for all wheels. Standard tightening (460/
”)Fi standard V7.T7 and R7 grinding wheels 19.
◎ Retention of rough surface during baking was good at all degrees of bonding of the standard texture number 7 grinding wheel. The coarse-structured grindstones, especially the R-grade grindstones 11 to 14, which have higher porosity, showed extremely high densification during baking. RIO grindstone 14 achieved the maximum densification of 9.8- in terms of theoretical VB degree versus VS (coupling f/set m). It was observed that the roughness retention was excellent in all OR grade stones.

Wheels 20-23 with coarser textures V11-V13 achieved a moderate increase in density If of about 4% during baking and were structurally more stable, whereas standard V7 wheels 19 had a 1.4- The increase was clearly bigger than it sounds.

For example, grinding wheel 20, which theoretically has Vll, has achieved the degree of bonding/structure Xl0 (6% porosity) 1 after hardening, whereas grinding wheels 19 to 23, which have coarser structures, depend on the ratio of resin to abrasive material. It showed the rough surface disappearance of different @ roses.

V grade grinding wheels 22 and 2 with organization numbers 12 and 13
3 showed a loss of 65 inches of rili roughness, and in fact the V13 wheel 23 followed almost perfectly the interlayer material used to separate the wheels during baking and curing.

F+ To He ~ To Each of the grinding wheels 11 to 23 was attached to a 5 ton @ Ml 50 hydraulic cutting machine, and the cutting speed was 12000 mfpm (61,0
ampm) and diameter 3/! with feed rates of 2.5, 4, and 6 seconds/cut! Table 8 shows the average of the results obtained by dry cutting 304 stainless steel material of 3.81 inches and making 20 pieces for each grinding wheel.

The average comparative performance of each rough-surface grinding wheel for cutting 304 stainless steel is the standard rough-surface R7, T, which is considered to be 100%.
7. It can be easily compared with V7 grindstones 11415 and 19. As can be seen, grinding wheels with similar textures for each degree of bonding group are generally standard R7, T7. Consumes less power than V70 grinding wheel, has better performance, and has a grinding speed of 24-52
It has excellent G ratio and grinding wheel life. Coarse texture showing the best performance 14. RIO and +20. V11g stone is standard 11. R7 and φ19. V7 whetstone] 52 and 35 wheels have achieved excellent lifespan and G ratio.
.

Cutting wheels 11 to 23 with the same rough surface were cut to t2000.
.

It rotates at gfpm (61,0ampm) and i! Diameter 3
/2 inch (3,813) + DC101B carbon'lAm
'frRrV -1' grinding wheels 11-14 are 3, 4, and 5 seconds/cut, T and V grade grinding wheels 15-23!
The average comparative performance of each grinding wheel is shown in Table 9. Dry cutting at feed speeds of 2.5, 3, and 4 seconds/cut (30 pieces per grinding wheel) All test results show that the rough textured/multi-active filler grinding wheel improves the quality and flexibility of grinding.
) shows a significant improvement. For example, the grinding wheel 14, i.e. RIO with high active filler (after curing VS
) achieved longer wheel life across 37 wheels than the standard ◆11° R7 wheel, but with equal flexibility. The standard grinding wheel 17, T11 (W-X9 after hardening) is 15°.
@Whetstone 20, which achieved 63% longer lifespan than the 7-wheel, with the same cutting quality and flexibility
l (after hardening X10) is 2 compared to the standard 19°v7 whetstone
4-Achieved a long service life, but cuts extremely sharply,
In addition, cutting was performed without burning at a feed speed of 4 seconds/cut. φ22. It was envisioned that V13 may have performed better than the results shown, but the slight loss of rough surface finish adversely affected the results.

Similarly, the quality of grinding is particularly markedly improved with V-grade, coarse-textured wheels that contain high concentrations of active fillers.
This is the first time that it has been possible to cut 1018 gray cable steel at a feed rate of 4 seconds/cut without seizing and at the same time obtain a phenomenally high average G ratio of 4.76 (grinding wheel 20.Vll). Table 0@10 shows the results of the grindstone bursting rate test conducted on grindstone compositions 11 and 13 to 20 of each degree of bonding and coarse structure. Grindstone 20 was not tested because no usable test grindstone was obtained.

Table 10 in the margin below shows the stronger strength of the grinding wheel with a rough texture compared to the standard grindstone with texture number 7. - The better strength of the grindstone with a coarse texture is the strength of the grindstone with texture number 7. whetstone 11,
15. Attributable to higher densification during baking and curing compared to 20. From the data given, with reference to Nos. 1, 4 and 7, a coarser texture is obtained at each specific degree of bonding. In this case, it is important to note that the filler volume ratio increases with respect to both resin and abrasive, primarily because the filler compensates for the loss of abrasive and maintains a substantially constant volume of resin and pores. As calculated, the composition ratio of all grinding wheel compositions coarser than standard texture number 7 is 1 part by volume of filler to 1 part resin.
．． 15 to 3 parts by volume and 1.3 to 4.1 parts by volume of abrasive material.

However, according to the present invention, in the grinding part of the whetstone composition, 0.8 to 2.6 parts by volume of w fat per 1 part by volume of the filler and 1 part by volume of the grinding part! It is preferable that the volume is θ˜3.2 volume. In contrast, the standard texture No. 7 grinding wheel contains 5 to 6.25 parts by volume of abrasive material to 1 part by volume of filler and is rated at 411 W! Ti
3 parts by volume] is not small.

Thus, the test data conclude that the performance and service life of relatively hard-bonded, coarse-textured grinding wheels cannot be compensated for by active light crosspieces for the reduction in abrasive content and therefore the grinding in the wheel It has been shown that significant improvements can be made by increasing the volume ratio of filler to both material and resin.

Although not specifically disclosed, it is obvious that the technical idea of the present invention can be applied to other modifications of cold-formed organic bonded grinding bodies. In particular, grinding bodies with medium to coarse grid size grinding parts. For example, a single ring-shaped circumferential grinding wheel, which is usually mounted on a rotary wheel for mounting the drive shaft (main shaft) K of a grinding machine, a single circular end-face grinding wheel, that is, a disc grinding wheel, and both circumferential and end-face grinding wheels. segment grinding wheel.

The invention thus described represents a significant and unexpected advance over the state of the art in the relevant field.

It is to be understood that the invention is not limited to the particular embodiments described, but includes all embodiments and modifications within the scope of the claims. Patent application agent: Akira Aoki, patent attorney, Kazuyuki Nishidate, patent attorney, Tetsuko Koga, patent attorney, Akira Yamaguchi.

Claims (1)

[Claims] 1. A) Fused aluminum oxide abrasive grains of 12 to 100 grid size, fused alumina-zirconia abrasive grains, sintered aluminum abrasive grains, sintered xite abrasive grains, sintered aluminum abrasive grains, Abrasive grains expressed from zirconia abrasive grains, silicon carbide abrasive grains, or mixtures thereof 30 to 44 volumes - 1 mouth) Thermosetting resin 24 to 36 volumes - (to) Active filler 14 to 29 volumes - 1 and → Pores 5
A grain-structured organic matter bonded grinding body having a grinding section comprising ~18 volumetric parts. λ The amount of the thermosetting resin and the active filler is 0.8 to 2. A grain-structured organic matter bonded abrasive body according to claim 1, wherein the ratio is one part by volume of active filler. 3. The thermosetting resin is phenol formaldehyde resin, phenol furfural resin, aniline formaldehyde resin, urea formaldehyde ram, cresol aldehyde resin, resorcinal aldehyde resin, urea aldehyde resin, meth2 formaldehyde resin, phenol wm, :cl xy The grain structure organic substance bonded ground body according to claim 1, which is a resin or a mixed resin thereof. 4. The amount of the abrasive grains and the active filler is 1.0 to 3 abrasive grains.
．． A grain-structured organic bonded abrasive body according to claim 1, wherein the ratio is 2 parts by volume to 1 part by volume of active filler. 5. The active filler is potassium fluoroborate, potassium sulfate, potassium aluminum fluoride, potassium magnesium sulfate, iron sulfate, cryolite, fluorite, magnesia, lead oxide, sodium chloride, pyrite, iron disulfide, and alkali metals. Claim 1 includes a material consisting of a chloroferrate, an alkali metal chlorofluoroferrate, a copolymer of vinylidene chloride and vinyl chloride, polyvinylidene chloride, divinyl chloride, or a mixture thereof. The coarse-structured organic matter bonded ground body described in 6. 2. The grain-structured, organic-bonded abrasive body of claim 1, wherein said active filler comprises a mixture of potassium sulfate and iron disulfide, and said thermosetting resin is a phenolic resin. 7. The material of the active filler is an inorganic sulfide, an inorganic sulfate,
The grain-structured organic substance-bonded grinding body according to claim 1, wherein said material is an organic or inorganic halide, a metal oxide, or a mixture thereof. 8. The grinding part further includes at least one rough surface with a gap between the tips (peaks) of the abrasive grains and the Q valleys between them, which is large and has a predetermined depth, so as to carry out the cutting work of the grinding part. 2. The coarse-grained bonded grinding body according to claim 1, wherein the grinding body has a high height and substantially reduces seizing of the work piece. 9. Claim f$1 in which the grinding body constitutes a rotating grindstone
The grain structure organic substance bonded grinding body described in . 10. The grain structure organic matter bonded grinding body according to claim 9, wherein the grinding body constitutes a rotating cutting grindstone.